Can anyone let me know the maximum default rpm for x'fire on 2004 m/trans models? mine is just 4k rpm!

 

Should be about 6,200 rpm max.

 

danimal is right 6,200 rpm is where the rev limiter kicks in... if yours is cutting at 4k you need to have the ECU reflashed at the dealer... either that or check the calibration on your gauge...

 

If what I read in the automotive mags is true, it's set at 4k so you can't "launch" at any higher RPM than that. I think maybe that's what he's talking about.

 

Do you think he's talking about an un-loaded RPM?... Heck never tried that, it's a sports car not a dragster... Sorry for my ignorance... I can't see dumping the clutch on this car at 4k rpm... To each his own... I do know that the limiter is at 6,200 rpm but if you miss a shift while down shifting from 130 mph or so, it'll peg the gauge... Not recommended, I mis-shifted once going into a corner at the track and sent the motor spinning into F1 rpm's... Thought the motor was going to be toast....

We need him to clarify this... If it's un-loaded or under driving conditions... Trust me, 6,200 is the cut out...

 

TO HDDP: That's the only thing I could figure he was talking about. I'm like you, I wouldn't think of dumping the clutch on my XF at that RPM, but I wouldn't be surprised at how many on this site probably do.
Heck, if my car shut down every time I hit 4k, I'd never get up my driveway. (but then I have a long, steep driveway) LOL. I guess we won't know for sure until he logs back on.

 

Thanks for your help!!!

 

Well now, that certainly cleared things up.

 

I think he's talking about when the car is idling (unloaded) The car will cut out around 4k rpm. But as you're driving it will go to 6K.

 

That would make sense that the ECU was programmed to prevent the engine over-rev in neutral. That's why you need a DRBIII to dyno the car.

The question is, why the hell would you want to sit in neutral and over-rev the engine?

 

HDDP, by your own admission, you don't go to the "drags" much do ya?

 

Nope... Not a drag guy... I'm a sports car guy... SCCA & IMSA road racing... I plead my ignorance when it comes to seeing how fast you can drive in a straight line for a 1/4 mile... And I'm not all that interested in Oval Track racing either, even though I've done it... Now give me a good 3.5 mile road course and you'll see a big smile on my face... Chicanes into sweepers into a straightaway into a hairpin and back again... Now that's what I call FUN.

 

I was just trying to answer your question as to why anybody would over rev their engine while in neutral. The only place I ever see people doing it, is at the drags for a high RPM launch. Since TACHo never gave us an answer to our question, all we can do is guess as to what he was really talking about in the first place.
I've always enjoyed drag racing, but I'd love to try SCCA racing too. Maybe someday with my Miata.

 

You should... The spec miata groups here on the west coast are pretty big... Great little starter car for road racing...

 

Well I used to drag, not in this car, but I have taken it to the track once. I will say if you are revving to 4k you are really good with the clutch and you will be going through them fast. Or you have a nice set of slicks on there. I'm also hoping to get my first road course under my belt at the SRT Nats. I'm know at heart, I'm more of a road course guy, it just not as assessable around here or as cheap.

 

Our works van (Ford Transit) has a limiter of 3,000 rpm but only when the van is stationary, suppose Ford wanted to stop anyone trying to drag it! Turbo Diesel 2.5L.